Crossword puzzle clue "symbol on many sarcophagi"

(Arabic) an Egyptian symbol of life, resembling a looped cross, later adapted by Coptic Christians as their cross

a venomous snake, also ASPICK

CRYPT, a burial vault

(Greek) the sum of the self-preservative, as opposed to self-destructive, instincts

LOT, to separate into batches

to obstruct or prevent